Race Condition Affecting kernel-ipaclones-internal package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL8-KERNELIPACLONESINTERNAL-18437372
- published30 Jul 2026
- disclosed27 Jul 2026
Introduced: 27 Jul 2026
NewCVE-2026-64541 (opens in a new tab)How to fix?
There is no fixed version for RHEL:8 kernel-ipaclones-internal.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-ipaclones-internal package and not the kernel-ipaclones-internal package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
smc_cdc_rx_handler() looks up the connection by token under the link group's conns_lock, drops the lock, and then dereferences conn and the smc_sock derived from it, ending in sock_hold(&smc->sk) inside smc_cdc_msg_recv(). No reference is held across the lock release.
The only reference pinning the socket while the connection is discoverable in the link group is taken in smc_lgr_register_conn() (sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both under conns_lock. Once the handler drops conns_lock, a concurrent close() -> smc_release() -> smc_conn_free() -> smc_lgr_unregister_conn() can drop that reference and free the smc_sock, so the handler's later sock_hold() runs on freed memory:
WARNING: lib/refcount.c:25 at refcount_warn_saturate Workqueue: rxe_wq do_work refcount_warn_saturate (lib/refcount.c:25) smc_cdc_msg_recv (net/smc/smc_cdc.c:430) smc_cdc_rx_handler (net/smc/smc_cdc.c:502) smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445) tasklet_action_common (kernel/softirq.c:938) handle_softirqs (kernel/softirq.c:622) Kernel panic - not syncing: panic_on_warn set
Only SMC-R is affected. The SMC-D receive tasklet is stopped by tasklet_kill(&conn->rx_tsklet) in smc_conn_free() before the connection is unregistered, so it cannot run concurrently with the free.
Take the socket reference while still holding conns_lock, so the registration reference can no longer be the last one, and drop it once the handler is done.
References
- https://access.redhat.com/security/cve/CVE-2026-64541
- https://git.kernel.org/stable/c/1951bffbc6493ec34cff3956b29d4bc6606904a6
- https://git.kernel.org/stable/c/3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb
- https://git.kernel.org/stable/c/472e9d7c0d5b03be3ff91ff941f57da822b031bc
- https://git.kernel.org/stable/c/647b19e5cc145a2f1f685ae8ff3805a17356888c
- https://git.kernel.org/stable/c/8145b432136285e01091815b48ceb2dae261f262
- https://git.kernel.org/stable/c/8de4f665d0febfb92803dece377791a563fc7041
- https://git.kernel.org/stable/c/9d160b35cc34a2ba8229d07651468a7848325135
- https://git.kernel.org/stable/c/ce5aa8084329351086894aa34d77e40301d5bd3d